table of contents
| slasq4.f(3) | LAPACK | slasq4.f(3) |
NAME¶
slasq4.f -
SYNOPSIS¶
Functions/Subroutines¶
subroutine slasq4 (I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2,
DN, DN1, DN2, TAU, TTYPE, G)
SLASQ4 computes an approximation to the smallest eigenvalue
using values of d from the previous transform. Used by sbdsqr.
Function/Subroutine Documentation¶
subroutine slasq4 (integerI0, integerN0, real, dimension( * )Z, integerPP, integerN0IN, realDMIN, realDMIN1, realDMIN2, realDN, realDN1, realDN2, realTAU, integerTTYPE, realG)¶
SLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by sbdsqr.
Purpose:
SLASQ4 computes an approximation TAU to the smallest eigenvalue
using values of d from the previous transform.
Parameters:
I0
I0 is INTEGER
First index.
N0
N0 is INTEGER
Last index.
Z
Z is REAL array, dimension ( 4*N )
Z holds the qd array.
PP
PP is INTEGER
PP=0 for ping, PP=1 for pong.
N0IN
N0IN is INTEGER
The value of N0 at start of EIGTEST.
DMIN
DMIN is REAL
Minimum value of d.
DMIN1
DMIN1 is REAL
Minimum value of d, excluding D( N0 ).
DMIN2
DMIN2 is REAL
Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN
DN is REAL
d(N)
DN1
DN1 is REAL
d(N-1)
DN2
DN2 is REAL
d(N-2)
TAU
TAU is REAL
This is the shift.
TTYPE
TTYPE is INTEGER
Shift type.
G
G is REAL
G is passed as an argument in order to save its value between
calls to SLASQ4.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Further Details:
CNST1 = 9/16
Definition at line 151 of file slasq4.f.
Author¶
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| Tue Sep 25 2012 | Version 3.4.2 |